For issue date



C. T. HOLT.

POSITIONING DEVICE FOR METAL WORKING MACHINES.

APPLICATION man MAR. 14. 19!].

1,293,096. V Patented Feb. 4,1919.

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C. T. HOLT.

POSITIOMNG DEVICE FOR METAL WORKING MACHINES.

APPLICATION HLED MAR,14. 19H.

Patented Feb. 4, 1919.

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3 nueufo-z gfdrmrf Z 195/! quate tools upon the main slide, acylindrical part may be positioned. turned as to its exterior, andtrimmed as to its ends without necessitating any unusual amount ofdelicate positioning on the part of the operative. The part to be turnedis merely slid on to the mandrel against the stop; the mandrel isexpanded; and it is then in position to be accurately turned and trimmedb the tools.

In the accompanying drawings, the device is shown in connection with alathe which has various details which in no way affect the operation ofthe stop device more than would be the case in any form of lathe. Theparticular form of device shown is merely illustrative, in conjunctionwith the stop and its direct cooperation and co-action with the tools,of a metal-working machine.

Referring to said drawings, the numeral 1, denotes a frame-work whichcarries the usual slide blocks 2, for the main cutting tool 3, and thecross slide block 4, for the crosscut tools 5. It, of course, also bearsthe spindle 6, which, through suitable gears is connected with thedriving mechanism for the spindle and is provided with chucking devices,etc.

As illustrated in the drawings, the spindle 6, has a longitudinalmovement induced by a collet 7, through the connection of a hand-lever8, pivoted to the frame through a lathe 9, and adapted to advance orretract the spindle or the parts mounted upon and connected therewith.

The spindle 6, is driven through sultable gearing and a gear 10, orother suitable driving connections and may operate as a chucking spindlein the ordinary method of such machines. In Figs. 1 and 2, a chuckingdevice 11, is illustrated merely to define the type of machine.

Ordinarily, in practice, the chucking device 11, operates the feed tubeof the spindle, and is provided with an adjustable stop 12, whichdetermines the action thereof of rearward movement of the lever 8.

All of these parts are well-known in the art. In the present instance,instead of utilizing a chuck such as is commonly employed, an expandingmandrel 13, is used in connection with the faceplate 14, or otherattachment of the spindle.

This expanding mandrel is actuated by longitudinal movement of thespindle or ordinary feeding tube through the manipulation of the lever8, and coiiperates with the stop mechanism hereinafter defined.

The expanding mandrel consists of a tapered tail-piece 15, which fitsthe face-plate 14, or other element, and has an extended shank 16,terminating in a tapered head 17 Over this tapered head is fitted anexpansible member 18, which forms the direct arbor upon which the workis to be located. The above parts have a central bore through whichpasses a spindle 19, which impinges on its outer end through a collar20, and adjusting nuts 21, against the expanding part 18. The spindle19, is connected with the reciprocating and rotary spindle 6, and it isobvious that upon a movement of the spindle 19, the expansible member18, will be moved relatively to the tapered head piece 17, and willtherefore be expanded to old the stock or work or will be moved torelease said stock or work dependent upon the movement of the operatinglever 8, which moves the main spindle or sleeve 6.

X indicates a piece of work or tubular member which must be finished asto its exterior by the main tool 3, and must be trimmed as to its endsby the cross-cut tools 5.

With the above, general delineation, the essence of the invention may bedefined as consisting of a stop mechanism cooperating with the expandingmandrel; definitely loeating the work or the stock piece X, where themain tool 3, will perform its function with a minimum of movement; andthe cross tools 5, will always operate upon the stock without necessityof accurate location other than that of forcing the stock against thestop.

Connected with the collet T, and moved thereby is a sliding sleeve 22,which sleeve slides upon a pin 23, fixed to the machine base or casing.This member 22, is con nected through the collet and its connectionswith the lever 8, so that it is moved when said lever is moved. Thesleeve has a boss 24, through which extends a stopbar 25. Said bar ismade adjustable in said boss and may be locked by nuts 26, 27.

The bar extends through bearings 28, 29, formed on the gear-housing orother convenient part of the machine so that it may have a direct,reciprocating motion when the lever 8, is moved.

The forward end of the stop-bar 25, extends downwardly as at 30, and hasan enlarged end 31, to serve as a stop and abutment to locate thearticle which is being placed upon the mandrel.

It will be understood that the stop-bar 25, is moved by the lever 8,which, of course, actuates the spindle, feed tube, or similar device andin turn actuates the expanding mandrel 13.

In operating the device, the cross slide 4, with its tools 5, is locatedalong the slidebed in a definite position to perform a transverseoperation and out n on the stock. lVith the tools backed o and with themain cutting tool 3, at one limit of its play, the lever 8, is thrownforward to release the expanding mandrel. This movement of the leverthrows the stop-bar 25, forward until its head 31, is in exact positionto aline the stock with the cross-cut tools 5. The

stock is then placed over the mandrel and forced against the fixed stop.The lever 8, is then thrown backward, ex ending the mandrel to hold thestock in def led position with reference to the cross-cut? tools 5. Thisoperation locks the stock upon; the mandrel in definite position withreference to the tools. The main tool 3, and the cross-cut tools may nowbe advanced simultaneously and, of course, in the meantime the fixedstop has been retracted by the movement of the lever 8, so that thetools have a clear field for operation.

As soon as the operation of the tools has been completed, the lever 8,is thrown forward carrying with it the fixed stop ready to receiveanother piece, and the finished piece of stock or work may be removed.

The advantages of the device will be apparent inasmuch as the stop,co-acting and moving with the lever simultaneously with the operation ofthe expanding mandrel, permits the locating of the work or stock indefinite position where the tools will require no special adjustmentwith reference to the stock". The speed of hendling and operating such amachine is meterialiy increased; and in place of having skilled labor,ordinarily required, for locking the work upon the spindle or mandrel,entirely unskilled labor may be employed.

After the tools are once adjusted in the slides and the slides are setbetween their ordinary stops, it is only necessary to throw forward thelever; place a piece of stock on the expanding mandrel and against thestop; throw back the lever and advance the tools.

Of course, it is quite obvious that the device as illustrated shows ahand-operated lathe. There is, of course, no reason why the same stopdevice might not be equally well applied to an automatic machine. Itinvolves in the main the advancement and retraction of a fixed stop fordefinitely looking a stock or work" with reference to the cutting toolsfor performing a complete series of operations both as to exterior finish and end finish and sizing of the stock. Obviously. the exact detailsof the mechanism might be modified and varied to suit the exigencies ofany particular case so long as the stop locates the stock definitelyupon the spindle during the movement of the actuating mechanism for saidspindle.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a device for positioning and finishing tubular pieces. thecombination of a spindle. an expanding mandrel cooperating with saidspindle for interiorly holding and releasing the tubular pieces, a stopdevice, and connections intermediate the stop device and the spindle,whereby the tubular piece is definitely located upon and clutched bysaid spindle with its periphery and ends accessible to cutting tools,

. 2. A positioning device consisting of an adjustable stop connectedwith the spindle operating mechanism of a metalovorhing machine andadapted to engage a tubular piece of work, means for actuating thespindle mechanism including an expanding mandrel, means for moving saidstop in predetermincd relation with reference to the control of thespindle and expanding mandrel whereby the tubular piece is definitelylocated upon the mandrel with reference to the cutting tools, andcutting tools operating upon the periphery and ends of the tubularpiece.

3. In a device of the character described, a spindle, an expandingmandrel rotated thereby, means for opening and closing said expandingmandrel, a reciprocating stop actuated by said means for locating atubular piece of work upon the expanding mandrel, and cutting toolspositioned to operate upon the periphery and ends of the tubular piece.

4. In a device of the character described, a spindle, a lever foractuating said spindle, an expanding mandrel rotated by the spindle andexpanded and contracted by the operating lever, a reciprocating stopsliding with said actuating means and spindle for positioning a tubularpiece upon the expanding mandrel, and cutting tools positioned to finishthe entire exterior of the tubular piece.

5. In a device of the character described, a spindle, a. lever foractuating said spindle, an expanding mandrel rotated by the spindle andexpanded and contracted by the operating lever, an adjustablereciprocating stop sliding with said actuating means and spindle forpositioning a tubular piece upon the expanding mandrel, andcross-cutting tools positioned to operate upon the ends of said tubularpiece and a side-tool for trimming said piece longitudinally.

6. in a device of the character described, a rotary s indle, a lever forreciprocating said spin le, an expanding mandrel expanded and contractedby the reciprocations of the spindle. a lever for moving said spindle toactuate the expanding mandrel, a reciprocating stop connected with saidspindle and lever, said stop forming an abutment for positioning atubular piece upon the mandrel when said mandrel is contracted, andcutting tools definitely located to engage said tubular piece whenpositioned against the stop.

7. In a device of the character described, a. rotating reciprocatingspindle; an expanding mandrel connected therewith, adapted to be rotatedwith said spindle and actuated in its expanding and contractile actionby the reciprocations thereof; a lever for actuating ating upon saidtubular piece to finish its said spindle, 1a slidipg sto actuatedfwivitg ends simultaneously.

said lever anc spind e and ormin a Xe abutment for a tubular piece as itapplied CLARENCE HOL t0 the expanding mandrel, said stop movingWitnesses:

away from the tubular piece upon expan' E. LOWANDE,

sion of the mandrel, and cutting tools oper- A. FISHER.

Copies 01' this patent may be obtained for five cents each, by Greeningthe "Gommiuioner of Patents,

Washington, D. 0."

